Change-speed gear



Apri@ 27 92@ 1,582,489

A. LAMB CHANGE SPEED GEAR Filed April 5. 1925 Patented Apr. 27 i926.

ADOLF LAUB, OE BASEL, SWITZERLAND, ASSIGNR TO THE FIRM PROGRESSION SOCIT ANONYME, OF LA CHAUX-DE-FONDS, SWTZERLAND.

CHANGESPEED GEAR.

Appncanon inea A'pn 3, 1925. sel-iai no. 20,498.

To all whom 2f may concer/n.'

Be it known that l, A Dotr linnn, a citizen ot' the Swiss Republic, and resident of Basel, Switzerland, have invented new and useful lmprovements in Change-Speed Gears, of which the following is a t'ull, clear, and enact specification.

The invention relates to a change speed gear nrovided With clutch members movable eccentrically With respect to the rotary shaft of the gear, the clutch members transmitting' the motion of the driving element to the driven element by their i'rictional engaeement in a conical groove. The sad clutch members or teeth arranged round about are pressed-one after the other into Jiirietional engagement in said conical groove by a control ring serving as a guide theretor, disengaging means being provided to adjust the control ring in such a manner that it holds the Vclutch members or teeth in a freely running position so as to prevent their engagement.

The drawing illustrates av torni ot construe-tion ot the change speed gear acc-ording to the prese-nt invention.

Figure l is an axial section ot the change speed gear.

Figure 2 is a cross section through the line A-B of Figure l.

Figure 3 line C-) ol Figure l.

Figure -l is a` rear view.

0n the driving shaft L is fastened a driving dise Z), in which radial grooves?)1 are provided. in these grooves the quadrilateral heads c1 of laterally projecting pins c are radially adjustable, to which are tast ened the radial conica-l teeth d. rlhe pins c are provided with rollers c2 and c3, by which they are guided on annular races of a control ring f so that they remain parallel to the shaft a during the rotation ot the driving disc o, in which rotation they participate. The annular set ot teeth CZ torn'is the. act-ual clutch inenibers -for transmitting the motion, and is disposed eccentrically wit-hin an inner ring 7L tast to the pulleyg to be driven. The ring 7L is formed with a conical groove h1 on its inner side, this .groove being in the radial plane of the teeth (Z. rl`he control ring f is acted upon by tivo springs L, which are supported'on a. stationary part Within the pulley g, so that it is urged in one direction is a cross section. through theY towards the rino' t to press the teeth d on one side into rrictional engagement with the annular groove itl oit the ring /i and on vthe diametrically opposite side right out ot with the annular groove itl. ln this posi-` tion the pulley is loose.

rllre pulley g together with all the parts arried by it can be moved along a dovetailed guide p of a stationary support y] in the direction of ay diameter ot the pulley, ivhieh gives rise to no ditiiculties for the case where the pulley belt runs at an angle to this direction ot' movement. By this arrangen'ient the setotI the teeth CZ, which participates in the movement, is so positioned in relation to its eccentricity to the shalt a, that the teeth d iii the driving position, at the top in Figure. l, come into action on a greater or smaller radius, thus giving a corresponding'gear ratio.

On rotation of the driving' disc o the teeth cl one after the other enter increasingly deeper into the annular groove zl ot the ring 7i, until they reach the deepest possible position at the top in Figure l. ln this position they are coupled to the ring z, and transmit their movementl to the. same and thus to the pulley g. The same action repeats itself for every tooth Z aud a. continuous rotation is obtained for the pulley g. It the pulley is to be treed, which can be etiected at anytime, the eccentric pin m is turned by handle m1 so that the control. ring f and theretore the teeth (Z are. adjusted to a position concentric with the grooved ring 71., thus disengaging the teeth Z from the groove fil so that they can 'freely rotate therein.

lVhat l'claini is l. A change speed gear, comprising a rotary driving element, a rotary driven element, interconnecting pieces between them. radial guidings for said pieces, an annular setoi conical friction clutch teeth in rotational relation With said interconnecting pieces, an annular friction groove on one ot Said rotary elements adapted to receive anccessirely said friction clutch teeth, a controlling guide ring to guide the latter so as to allow the saine to progressively enter said friction groove to produce an operative frictional connection thereon, and adjusting ineans for said guide ring to adjust the clutch teeth to a freely running position with respect to said friction groove.

Q. A change speed gear, comprising a rotary driving element, a rotary driven elen'ient, interceiniecting pieces between thein, radial guidings for said pieces7 an arnizilar set of conical friction clutch teeth in rotational relation ivith said intercoiniect-ing pieces, an annular Jfriction groove on one of said rotary elements adapted to receive snccessively said friction clutch teeth, ay controlling guide ring to guide the latter eccen trically With regard to said Yfriction groove for their srccessive :l'rictional engagement with Said groove, spring means urging said guide ring in the direction ol" frietional engagement ot the clntch teeth7 and adjusting means for said guide ring lo adjust the. clutch teeth to a comentric inoiiieratire position with respect to said friction groove,

In Witness whereof l have hereunto signed `my naine this. 23rd day ol March 19;:3.

A DOLl` LA UB. 

